Blood pressure is the measure of the force of blood pushing against blood vessel walls. The heart pumps blood into the arteries (blood vessels), which carry the blood throughout the body. High blood pressure, also called hypertension, is dangerous because it makes the heart work harder to pump blood to the body and contributes to hardening of the arteries, or atherosclerosis, and to the development of heart failure.
A blood pressure reading has a top number (systolic) and bottom number (diastolic). The ranges are:
People whose blood pressure is above the normal range should consult their doctor about steps to take to lower it.
Blood Pressure Category | Systolic mm Hg (upper #) | Diastolic mm Hg (lower #) | |
Normal | less than 120 | and | less than 80 |
Prehypertension | 120 – 139 | or | 80 – 89 |
High Blood Pressure (Hypertension) Stage 1 | 140 – 159 | or | 90 – 99 |
High Blood Pressure (Hypertension) Stage 2 | 160 or higher | or | 100 or higher |
Hypertensive Crisis (Emergency care needed) | Higher than 180 | or | Higher than 110 |
What Causes High Blood Pressure?
The exact causes of high blood pressure are not known, but several factors and conditions may play a role in its development, including:
Who Is More Likely to Develop High Blood Pressure?
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